Oct 21, 2025 · Pathogens—bacteria, viruses, fungi, and parasites—are microorganisms that invade a host and cause illness. Learn more and how to protect yourself.

Pathogens are tiny organisms that can make you sick if they get inside your body. Viruses, bacteria, fungi, parasites and prions are pathogens.

The ability of a pathogen to cause disease is called pathogenicity. The degree to which an organism is pathogenic is called virulence. There are five main types of pathogens: virus, …

Diseases in humans that are caused by infectious agents are known as pathogenic diseases. Not all diseases are caused by pathogens, such as black lung from exposure to the pollutant coal …

Apr 26, 2025 · Two main types of pathogens can infect you: Facultative pathogens. This type of pathogen can reproduce in a host or somewhere else, like on a surface in your home. Obligate …

Apr 29, 2025 · Understanding the different types of pathogens is essential for developing effective prevention and treatment strategies. This article explores the major categories of …

Below are the categories of pathogens that we currently know about. Some are more well-known than others. It is important to remember that often the symptoms - and even disease …

Nov 10, 2025 · A pathogen is any agent that can cause disease in its host, ranging from microscopic life forms to non-living particles. Scientists group these disease-causing agents …

Apr 3, 2019 · There are different types of pathogens, but we’re going to focus on the four most common types: viruses, bacteria, fungi, and parasites. Viruses are made up of a piece of …

Revise the four main types of pathogens: bacteria, viruses, fungi, and protists. Learn how they cause disease and how the body defends itself. Includes real-world disease examples.